Red Seal Electrician Practice
MotorsQuestion 1261 of 1506

Which NEMA design has the highest starting torque with low starting current, but a high slip and poor speed regulation?

  1. Class D
  2. Class A
  3. Class B
  4. Class E
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Correct answer: Class D

Class D has 5% to 13% slip at full load. It suits punch presses and shears.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.7: Tesla Polyphase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026